NEUTRINO MASSES AND MIXINGS IN SO(10)M

2000 ◽  
Vol 15 (01) ◽  
pp. 15-22 ◽  
Author(s):  
M. ABUD ◽  
F. BUCCELLA ◽  
F. TRAMONTANO ◽  
D. FALCONE ◽  
G. RICCIARDI
Keyword(s):  
Neutrino Masses ◽  
Solar Oscillations ◽  
Seesaw Mechanism ◽  
The Right ◽  
Neutrino Masses And Mixings ◽  
Good Agreement

Assuming a Zee-like matrix for the right-handed neutrino Majorana masses in the seesaw mechanism, one gets maximal mixing for vacuum solar oscillations, a very small value for Ue3 and an approximate degeneracy for the two lower neutrino masses. The scale of right-handed neutrino Majorana masses is in good agreement with the value expected in an SO (10)M model with Pati–Salam SU (4)× SU (2)× SU (2) intermediate symmetry.

scholarly journals A topological approach to neutrino masses by using exotic smoothness

2019 ◽  
Vol 34 (13) ◽  
pp. 1950097 ◽  
Author(s):  
Torsten Asselmeyer-Maluga ◽  
Jerzy Król
Keyword(s):  
Sterile Neutrino ◽  
Topological Invariants ◽  
Neutrino Masses ◽  
Topological Approach ◽  
Seesaw Mechanism ◽  
3 Dimensional ◽  
Dimensional Spacetime ◽  
Topological Transitions ◽  
The Right ◽  
Good Agreement

In this paper, we will consider a cosmological model with two topological transitions of the space. The smooth 4-dimensional spacetime of the model admits topological transitions of its 3-dimensional slices. The whole approach is inspired by a class of exotic smoothness structures on [Formula: see text]. In particular, this class of smoothness structures induces two topological transitions. Then, we are able to calculate the energy scales as associated to these topological transitions. For the first transition we will get the value of the GUT scale and the energy of the second transition is at the electroweak scale. The topology of the exotic [Formula: see text] determines both, the energy of the scales by certain topological invariants, and the existence of the right-handed sterile neutrino. It is the input for the seesaw mechanism. Secondly, based on this model, we are able to calculate the neutrino masses which are in a very good agreement with experiments. Finally, we will speculate, again based on topology, why there are three generations of neutrinos and an asymmetry between neutrinos and anti-neutrinos.

scholarly journals MUONIUM–ANTIMUONIUM OSCILLATIONS AND MASSIVE MAJORANA NEUTRINOS

2004 ◽  
Vol 19 (04) ◽  
pp. 297-306 ◽  
Author(s):  
T. E. CLARK ◽  
S. T. LOVE
Keyword(s):  
Matrix Element ◽  
Interesting Case ◽  
Neutrino Masses ◽  
Leading Order ◽  
Seesaw Mechanism ◽  
The Standard Model ◽  
Oscillation Process ◽  
Majorana Neutrinos ◽  
Order Matrix Element ◽  
Neutrino Masses And Mixings

The electron and muon number violating muonium–antimuonium oscillation process can proceed provided that neutrinos have nonzero masses and mix among the various generations. Modifying the Standard Model only by the inclusion of singlet right-handed neutrino fields and allowing for general neutrino masses and mixings, the leading order matrix element contributing to this process is computed. For the particularly interesting case where the neutrino masses are generated by a seesaw mechanism with a very large Majorana mass MR≫MW, it is found that both the very light and very heavy Majorana neutrinos each give comparable contributions to the oscillation time scale proportional to [Formula: see text]. Present experimental limits set by the non-observation of the oscillation process sets a lower limit on MR of roughly of order 104 GeV.

scholarly journals Neutrino masses in a supersymmetric model with exotic right-handed neutrinos in global 𝒵3 ⊗ (B − L) symmetry

2021 ◽  
Vol 36 (02) ◽  
pp. 2150010
Author(s):  
M. C. rodriguez
Keyword(s):  
Experimental Data ◽  
The Other ◽  
Tree Level ◽  
Supersymmetric Model ◽  
Neutrino Masses ◽  
Seesaw Mechanism ◽  
Mixing Angle ◽  
Neutrino Sector ◽  
Left Handed ◽  
The Right

We build a supersymmetric model with [Formula: see text] gauge symmetry, with a global [Formula: see text] symmetry. The [Formula: see text] symmetry is necessary to keep the proton stable at least at tree level. There is also a global [Formula: see text] symmetry, where [Formula: see text] and [Formula: see text] are the usual baryonic and leptonic numbers, respectively. We introduce three nonidentical right-handed neutrinos plus new scalars fields. After symmetry breaking, the right-handed neutrinos together with one left-handed neutrino get Majorana masses via the seesaw mechanism. The other two left-handed neutrinos get their Majorana masses at 1-loop level. We will also explain the mixing angle in the neutrino sector in agreement with the experimental data and we get several interesting candidates to the observed dark matter.

scholarly journals APPROXIMATE FLAVOR SYMMETRIES AND SEESAW MECHANISM

1995 ◽  
Vol 10 (24) ◽  
pp. 1761-1767
Author(s):  
KANG YOUNG LEE
Keyword(s):  
Neutrino Mass ◽  
Neutrino Masses ◽  
Lepton Sector ◽  
Seesaw Mechanism ◽  
Flavor Symmetries ◽  
Neutrino Masses And Mixings

We study the approximate flavor symmetries imposed on the lepton sector assuming seesaw mechanism as the neutrino mass structure. We apply the symmetry to various neutrino phenomenologies and obtain constraints on neutrino masses and mixings.

scholarly journals NEUTRINO MASSES AND MIXINGS

1999 ◽  
Vol 14 (39) ◽  
pp. 2701-2708 ◽  
Author(s):  
SHE-SHENG XUE
Keyword(s):  
Standard Model ◽  
Free Particle ◽  
Neutrino Masses ◽  
Energy Functions ◽  
Theoretical Understanding ◽  
Mixing Angles ◽  
Dirac Neutrino ◽  
Self Energy ◽  
The Right ◽  
Neutrino Masses And Mixings

We propose a novel theoretical understanding of neutrino masses and mixings, which is attributed to the left–right symmetric feature of the regularized standard model at short distances. We try to explain the smallness of Dirac neutrino masses and the decoupling of the right-handed neutrino as a free particle. Neutrino masses and mixing angles are completely related to each other in the Schwinger–Dyson equations for their self-energy functions. The solutions to these equations and a possible pattern of masses and mixings are discussed.

OVERVIEW OF SUSY GUT MODELS OF NEUTRINO MIXING

2003 ◽  
Vol 18 (22) ◽  
pp. 3971-3979 ◽  
Author(s):  
S.M. BARR
Keyword(s):  
Grand Unification ◽  
Neutrino Masses ◽  
Neutrino Mixing ◽  
Neutrino Masses And Mixings

A brief review is given of some ideas for explaining neutrino masses and mixings within the context of supersymmetric grand unification. Emphasis is put on so-called lopsided models.

scholarly journals THE PROBLEM OF NEUTRINO MASSES IN EXTENSIONS OF THE STANDARD MODEL

2001 ◽  
Vol 16 (32) ◽  
pp. 5101-5199 ◽  
Author(s):  
ISABELLA MASINA
Keyword(s):  
Proton Decay ◽  
Fine Tuning ◽  
Neutrino Masses ◽  
Flavor Symmetry ◽  
Mixing Angle ◽  
Grand Unified Theories ◽  
Triplet Splitting ◽  
Fermion Masses ◽  
The Standard Model ◽  
Neutrino Masses And Mixings

We review the problem of neutrino masses and mixings in the context of grand unified theories. After a brief summary of the present experimental status of neutrino physics, we describe how the see-saw mechanism can automatically account for the large atmospheric mixing angle. We provide two specific examples where this possibility is realized by means of a flavor symmetry. We then review in some detail the various severe problems which plague minimal GUT models (like the doublet–triplet splitting and proton-decay) and which force us to investigate the possibility of constructing more elaborate but realistic models. We then show an example of a quasirealistic SUSY SU(5) model which, by exploiting the crucial presence of an Abelian flavor symmetry, does not require any fine-tuning and predicts a satisfactory phenomenology with respect to coupling unification, fermion masses and mixings and bounds from proton decay.

scholarly journals K-meson neutrinoless double muon decay as a probe of neutrino masses and mixings

2000 ◽  
Vol 493 (1-2) ◽  
pp. 82-87 ◽  
Author(s):  
Claudio Dib ◽  
Vladimir Gribanov ◽  
Sergey Kovalenko ◽  
Ivan Schmidt
Keyword(s):  
Muon Decay ◽  
Neutrino Masses ◽  
K Meson ◽  
Neutrino Masses And Mixings

scholarly journals Minimal scoto-seesaw mechanism with spontaneous CP violation

2021 ◽  
Vol 2021 (4) ◽  
Author(s):  
D. M. Barreiros ◽  
F. R. Joaquim ◽  
R. Srivastava ◽  
J. W. F. Valle
Keyword(s):  
Dark Matter ◽  
Cp Violation ◽  
Vacuum Expectation ◽  
Vacuum Expectation Value ◽  
Discrete Symmetry ◽  
Double Beta Decay ◽  
Neutrino Masses ◽  
Seesaw Mechanism ◽  
Cosmological Observations ◽  
Scalar Singlet

Abstract We propose simple scoto-seesaw models to account for dark matter and neutrino masses with spontaneous CP violation. This is achieved with a single horizontal $$ {\mathcal{Z}}_8 $$ Z 8 discrete symmetry, broken to a residual $$ {\mathcal{Z}}_2 $$ Z 2 subgroup responsible for stabilizing dark matter. CP is broken spontaneously via the complex vacuum expectation value of a scalar singlet, inducing leptonic CP-violating effects. We find that the imposed $$ {\mathcal{Z}}_8 $$ Z 8 symmetry pushes the values of the Dirac CP phase and the lightest neutrino mass to ranges already probed by ongoing experiments, so that normal-ordered neutrino masses can be cornered by cosmological observations and neutrinoless double beta decay experiments.

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